Anthracnose

scouted Sept. 28, 2022

Scientific Name
Colletotrichum destructivum
Background
Soybeans in Vance County were scouted, and it was observed that 5% of the field was affected by damping-off, defoliation, and stunting. The impacted soybeans were located within a 25-acre section that had been sprayed by a chemical company. The soybeans in the sprayed area exhibited stunted growth.
Conclusion
The cause of disease was identified as Anthracnose, caused by Colletotrichum. While usually a disease that shows in the stems and the petioles, it can also cause leaf curling and reddening of the veins. Warm, wet weather favors infection and disease development. Crop rotation and tillage can reduce inoculum, while foliar fungicides will reduce disease, but it's usually not profitable.
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